* {
    margin: 0;
    padding: 0;
    list-style: none;
}

html,
body {
    width: 100%;
    height: 100%;
}

#box {
    width: 100%;
    height: 100%;
}

.banner {
    width: 100%;
    height: 160px;
    border: 1px solid #000;
    box-sizing: border-box;
    position: relative;
}

.banner ul {
    width: 100%;
    height: 100%;
    overflow: hidden;
}

.banner ul li {
    width: 100%;
    height: 100%;
}

.banner ul li img {
    width: 100%;
    height: 100%;
}

.btn {
    position: absolute;
    left: 50%;
    bottom: 20px;
    margin-left: -50px;
    display: flex;
}

.btn li {
    background: rgba(100, 4, 7, 0.4);
    border: 1px solid #483221;
    width: 20px;
    line-height: 20px;
    text-align: center;
    margin: 0 3px;
}

.btns {
    width: 100%;
    height: 30px;
    display: flex;
    justify-content: space-between;
    position: absolute;
    top: 50%;
    left: 0;
    margin-top: -15px;
}

.btns span:nth-of-type(1) {
    border: 1px solid #543222;
    margin-left: 15px;
}

.btns span:nth-of-type(2) {
    border: 1px solid #543222;
    margin-right: 15px;
}

.btn li.active {
    background: #b12033;
    color: rgb(255, 255, 255);
    font-weight: bold;
}